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<title>Fault Tree</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="../extensions/Figures.js"></script>
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;  // for conciseness in defining templates
      myDiagram =
        $(go.Diagram, "myDiagramDiv",
          {
            allowCopy: false,
            allowDelete: false,
            "draggingTool.dragsTree": true,
            layout:
              $(go.TreeLayout,
                { angle: 90, layerSpacing: 30 }),
            "undoManager.isEnabled": true
          });

      // when the document is modified, add a "*" to the title and enable the "Save" button
      myDiagram.addDiagramListener("Modified", function(e) {
        var button = document.getElementById("SaveButton");
        if (button) button.disabled = !myDiagram.isModified;
        var idx = document.title.indexOf("*");
        if (myDiagram.isModified) {
          if (idx < 0) document.title += "*";
        } else {
          if (idx >= 0) document.title = document.title.substr(0, idx);
        }
      });

      function nodeFillConverter(figure) {
        switch (figure) {
          case "AndGate":
            // right to left so when it's rotated, it goes from top to bottom
            return $(go.Brush, "Linear", { 0: "#EA8100", 1: "#C66D00", start: go.Spot.Right, end: go.Spot.Left });
          case "OrGate":
            return $(go.Brush, "Linear", { 0: "#0058D3", 1: "#004FB7", start: go.Spot.Right, end: go.Spot.Left });
          case "Circle":
            return $(go.Brush, "Linear", { 0: "#009620", 1: "#007717" });
          case "Triangle":
            return $(go.Brush, "Linear", { 0: "#7A0099", 1: "#63007F" });
          default:
            return "whitesmoke";
        }
      }

      myDiagram.nodeTemplate =  // the default node template
        $(go.Node, "Spot",
          { selectionObjectName: "BODY", locationSpot: go.Spot.Center, locationObjectName: "BODY" },
          // the main "BODY" consists of a Rectangle surrounding some text
          $(go.Panel, "Auto",
            { name: "BODY", portId: "" },
            $(go.Shape,
              { fill: $(go.Brush, "Linear", { 0: "#770000", 1: "#600000" }), stroke: null }),
            $(go.TextBlock,
              {
                margin: new go.Margin(2, 10, 1, 10), maxSize: new go.Size(100, NaN),
                stroke: "whitesmoke", font: "10pt Segoe UI, sans-serif"
              },
              new go.Binding("text"))
          ),  // end "BODY", an Auto Panel
          $("TreeExpanderButton", { alignment: go.Spot.Right, alignmentFocus: go.Spot.Left, "ButtonBorder.figure": "Rectangle" }),
          $(go.Shape, "LineV",
            new go.Binding("visible", "figure", function(f) { return f !== "None"; }),
            { strokeWidth: 1.5, height: 20, alignment: new go.Spot(0.5, 1, 0, -1), alignmentFocus: go.Spot.Top }),
          $(go.Shape,
            new go.Binding("visible", "figure", function(f) { return f !== "None"; }),
            {
              alignment: new go.Spot(0.5, 1, 0, 5), alignmentFocus: go.Spot.Top, width: 30, height: 30,
              stroke: null
            },
            new go.Binding("figure"),
            new go.Binding("fill", "figure", nodeFillConverter),
            new go.Binding("angle", "figure", function(f) { return (f === "OrGate" || f === "AndGate") ? -90 : 0; })), // ORs and ANDs should point upwards
          $(go.TextBlock,
            new go.Binding("visible", "figure", function(f) { return f !== "None"; }), // if we don't have a figure, don't display any choice text
            {
              alignment: new go.Spot(0.5, 1, 20, 20), alignmentFocus: go.Spot.Left,
              stroke: "black", font: "10pt Segoe UI, sans-serif"
            },
            new go.Binding("text", "choice"))
        );

      myDiagram.linkTemplate =
        $(go.Link, go.Link.Orthogonal,
          { layerName: "Background", curviness: 20, corner: 5 },
          $(go.Shape,
            { strokeWidth: 1.5 })
        );

      load();
    }

    function save() {
      document.getElementById("mySavedModel").value = myDiagram.model.toJson();
      myDiagram.isModified = false;
    }
    function load() {
      myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>
  <p>
    <em>Fault trees</em> are used to conduct deductive failure analysis in which an undesired state of a
    system is analyzed using Boolean logic to combine a series of lower-level events.
  </p>
  <p>
    This diagram uses a basic <a>TreeModel</a> and <a>TreeLayout</a> to layout nodes in a tree structure.
    The <a>Diagram.nodeTemplate</a> definition allows for text describing the undesirable states and,
    when necessary, a figure indicating an event/gate.
  </p>
  <p>
    The <b>visible</b> property on some of the node template's <a>Shape</a>s is set based on
    whether a figure is chosen for the node in the <a>Model.nodeDataArray</a>. The nodes also
    display a <b>TreeExpanderButton</b> allowing for expanding/collapsing of subtrees.
    See the <a href="../intro/buttons.html">Intro page on Buttons</a> for more GoJS button information.
  </p>
  <p>
    Related to deductive failure analysis is root cause analysis, or RCA. See the <a href="../extensions/Fishbone.html">fishbone layout</a>
    extension page for a diagram format typically used in root cause analysis.
  </p>
  <div>
    <div>
      <button id="SaveButton" onclick="save()">Save</button>
      <button onclick="load()">Load</button>
      Diagram Model saved in JSON format:
    </div>
    <textarea id="mySavedModel" style="width:100%;height:300px">
{ "class": "go.TreeModel",
"nodeDataArray": [
{"key":1, "text":"No flow to receiver", "figure":"None"},
{"key":2, "text":"No flow from Component B", "parent":1, "figure":"OrGate", "choice":"G02"},
{"key":3, "text":"No flow into Component B", "parent":2, "figure":"AndGate", "choice":"G03"},
{"key":4, "text":"Component B blocks flow", "parent":2, "figure":"Circle", "choice":"B01"},
{"key":5, "text":"No flow from Component A1", "parent":3, "figure":"OrGate", "choice":"G04"},
{"key":6, "text":"No flow from Component A2", "parent":3, "figure":"OrGate", "choice":"G05"},
{"key":7, "text":"No flow from source1", "parent":5, "figure":"Triangle", "choice":"T01"},
{"key":8, "text":"Component A1 blocks flow", "parent":5, "figure":"Circle", "fill":"green", "choice":"B02"},
{"key":9, "text":"No flow from source2", "parent":6, "figure":"Triangle", "choice":"T02"},
{"key":10, "text":"Component A2 blocks flow", "parent":6, "figure":"Circle", "choice":"B03"}
]}
    </textarea>
  </div>
</div>
    </div>
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